<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>

<button class="button1" id="btn1">按钮1</button>
<button class="button1" id="btn2">按钮2</button>
<button class="button1" id="btn3">按钮3</button>

<button class="button2" id="btn21">按钮1i</button>
<button class="button2" id="btn22">按钮12</button>
<button class="button2" id="btn23">按钮13</button>

<button id="btn4">运行1</button>
<button id="btn5">运行2</button>

<script type="text/javascript">
	
	document.addEventListener("click",function(){});
</script>

</body>
</html>